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All codes/P04A3

P04A3

Exhaust Pressure Control Valve B Intermittent

Moderate severity

Same as P049F with intermittent or erratic feedback - typically a connector or harness fault.

Same as P049F with intermittent or erratic feedback - typically a connector or harness fault.

Common causes

  • Intermittent contact at connector or terminal

    One of the most commonly reported causes for this code — check this first.

    high

    Typical part cost: $170-770

  • Connector with intermittent contact under vibration

    Less common, but worth ruling out after the more likely causes.

    low

    Typical part cost: $170-770

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First things to check

  1. 1Confirm the code with a scan tool and check for additional related codes.
  2. 2Inspect the relevant sensors, wiring, and connectors for damage or corrosion.

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Related codes

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Frequently asked questions

What does P04A3 mean?

P04A3 means "Exhaust Pressure Control Valve B Intermittent". It is a generic OBD-II code that points to a fault in the auxiliary emission controls.

What are the most common causes of P04A3?

intermittent contact at connector or terminal; connector with intermittent contact under vibration; harness routed against vibrating component — these are the most commonly reported causes. Verify with a proper diagnosis before replacing parts, or use the Wrenchify app for a vehicle-specific diagnosis.

Can I keep driving with this code?

The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical. Use the Wrenchify app for a full diagnosis specific to your vehicle.

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